Fix asyn build in CI. #85

Job	Run time
ubuntu-latest/adsupport/7.0/gcc/static	7m 42s
ubuntu-latest/os/7.0/gcc/static	6m 15s
ubuntu-latest/os/3.15/gcc/static	6m 15s
ubuntu-latest/os/3.15/gcc/default	10m 31s
ubuntu-latest/os/7.0/gcc/default	6m 45s
windows-2019/adsupport/7.0/vs2019/static	14m 39s
ubuntu-22.04/os/7.0/gcc/default	6m 13s
	58m 20s

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